Answer:
to produce gamate or reproductive cells.
to distinguish between male and female specie.
to produce tetrads having equal number of chromosomes
***HELP PLZ****Which of the following is not needed to maintain diversity in an ecosystem?
Keystone species
Producers
Invasive species
Consumers
Answer:
keystone species
Explanation:
Answer:
Invasive species
Explanation:
Which of the following groups of algae is notable for having members with silica cell walls?
a) Phaeophyta b) Chlorophyta c) Chrysophyta d) Rhodophyta
Algae in the following categories are distinguished for possessing silica cell walls. Correct Response Cryophyte.
What distinguishes Cryophyte?The Chrysophyceae and Synurophyceae groups of flagellates, which make up the majority of the cryophytes, are distinguished for their central and peripheral nervous systems flagella, yellow enhanced version, and silicified endogenous resting phases (stomatocysts). About 1200 species have been described in their entirety.
Why are chrysophytes referred regarded as diatoms?Diatoms are a form of photosynthesizing phytoplankton that are almost ubiquitous in wet environments, such as soils, freshwater pools of water, and seas. Cryophytes used to refer to all types of cellular brown algae in addition to diatoms. Diatoms are present in every terrestrial and aquatic habitat.
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Which of the following is an energetic trade-off in natural selection? Question 47 options: high survival rates of offspring and the cost of parental care choosing how many offspring to produce over the course of a lifetime and how long to live increasing the number of individuals produced during each reproductive episode and a corresponding decrease in parental care producing large numbers of gametes when employing internal fertilization versus fewer numbers of gametes when employing external fertilization
Answer:
high survival rates of offspring and the cost of parental care
Explanation:
Animals must optimize the energy invested in growing, surviving, reproducing, and leaving fertile offspring. They must ensure the perpetuity of the species. The best manner of doing it is by reaching sexual maturity, mating, and leaving progeny that also reaches their fertile age. So sometimes, they need to "decide" or "choose" where to invest more energy.
Those that "decide" to take care of their offspring invest too much energy in doing it. Parents must feed them, an activity that requires most of their energy to produce food or look for it. They must protect their progeny from potential opportunistic predators, so they need to be near the whole time. They need to teach behaviors and habits. And so many other things that require energy investment.
So, where do parents take all this energy from? The energy that is usually destined for survival and mating activities, is now destined for parenting. Often, parents can not feed properly because they can not leave their offspring alone. They face predators putting themselves in danger of being hurt. They can not mate even if they are in the reproductive season.
This is the Cost-benefits energetic trade-off.
Which is the benefit? To ensure the progeny survival, to make them reach their sexual maturity, and to reproduce too. They do it to ensure the perpetuity of the species.
So these species "choose" to have reduced offspring and to take care of them. Many other species "choose" to have many descendants and to avoid parental care. They invest their energy in surviving and reproducing.
Which of the following statements about the distribution of sap throughout a plant is true?
a) The driving force for sugar movement is transpiration.
b) The mechanism that explains the movement of sugars throughout a plant is called the pressure-flow hypothesis.
c) Companion cells form the conducting tissue for sap.
d) The main component of phloem sap is glucose.
The statements that are true about the distribution of sap throughout a plant are:
a) The driving force for sugar movement is transpiration.
b) The mechanism that explains the movement of sugars throughout a plant is called the pressure-flow hypothesis.
c) Companion cells form the conducting tissue for sap.
Transpiration is the process where water is lost from the leaves of the plant and the resulting negative pressure in the leaves pulls water from the roots.
The pressure-flow hypothesis describes how the pressure difference in the leaves and roots is used to drive the movement of sugars through the plant.
Companion cells are specialized cells found in phloem tissue that help to support the sieve tube cells which are responsible for the actual transport of sap.
Phloem sap is a complex mixture of sugars and other substances and not only glucose.
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What is the importance of mitosis for uni cellular organisms?
In unicellular organisms like bacteria, mitosis aids asexual reproduction by creating a near-exact duplicate of the parent cell.
A "amoeba" is another illustration of a eukaryotic, unicellular creature. An amoeba creates new life through cell division. Cell division in unicellular organisms is required just for reproduction. They divide their cells through a process called mitosis to create their daughter cells. Cell division is crucial for the development of new body cells and reproduction in multicellular animals. One pair of parents are used in asexual reproduction to create genetically identical kids. The primary method of cell division utilised by unicellular organisms is binary fission. The cell divides into two daughter cells that are genetically identical to one another.
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1)Sam needs 10 kg of lemons to make lemonade.If each of the bag weighs 1000 g how many bags does he need?
2)How many 250 g bags of grapes are needed to make 5 kg?
The fact that many of the proteins produced by humans have identical or nearly identical counterparts in chimpanzees suggests
that
A)
all proteins are basically the same.
B)
humans and chimps share a common ancestor.
o
humans and chimps have convergently evolved.
D)
humans and chimps actually belong to the same species.
Answer: B)
humans and chimps share a common ancestor.
Explanation:
Question 1 of 10
What about Earth allows it to maintain bodies of water?
OA. Strong magnetic field
OB. Strong gravity
O C. Lunar tides
OD. Plate movements
describe and explain the process or steps in the rock cycle off how sedimentary Rocks are formed
La medicina es una ciencia social y la política no es más que medicina a gran escala, por que?
Answer:
Todas estas referencias expresan hasta qué punto la enfermedad posee una dimensión psicológica, social y política.
Explanation:
Can someone help me answer this question please
Answer:
Ww,Ww
Explanation:
FF
NEED ASAP!!!
explain how mutations affect genes.
Explanation:
Random mutations in genes can potentially lead to advantageous characteristics. For example, a mutation in the genetic coding of a bacterium could lead to that bacteria becoming resistant to antibiotics. Mutations change the overall coding of a gene, and are normally harmless. Mutations are changes in the coding of DNA, they can lead to alterations in the polypeptide chain and so can lead to non-functional proteins.
Geographic isolation can cause which of the following?
a Hybridization
b Allopatric Speciation
c Sympatric Speciation
d Polyploidy
write a short note on genetic diversity and proper use of resource ?
Explanation:
Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species. ... Genetic diversity serves as a way for populations to adapt to changing environments.
The need to increase efficiency and productivity while preserving natural resources, especially water and soil, is great. ... Advertisement. In light of these realities, growers are under pressure to produce more, pollute less, fulfill consumer preferences, and make a living.
how do substances like carbon dioxide and water move in and out of cell?
no links please!
Answer:
Osmosis.
Explanation:
The substances like carbondioxide gas and water move inside and outside of the cell through a semi-permeable membrane of the cell is called osmosis. Osmosis is a type of diffusion in which molecules moves from higher concentration to lower concentration through a semi-permeable membrane of the cell. The concentration of carbondioxide gas is higher inside the cell due to the process of respiration moves outside the cell while on the other hand, water moves inside and outside of the cell when it is needed.
during early development all cells in the embry o of a mutlcielluar organim are indeitcal, Later on in development the cells wil become pseiczlied thorugh a process called
The cells in multicellular organisms are of various types, every kind plays precise functions. These cells can not stay independently.
They characteristic as agencies known as tissues and distinctive kinds of tissues shape organs. Organs collectively shape organ systems The 4 important approaches via way of means of which a multicellular organism is made: cell proliferation, cell specialization, cell interaction, and cell movement. In a growing embryo, some of these approaches are going on at once, in a kaleidoscopic range of various approaches in distinctive elements of the organism. In unicellular organisms, cell department is the approach of reproduction; in multicellular organisms, it's miles the approach of tissue increase and maintenance.
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Based on Figure 1, which of the following statements best predicts the effect that a change from a moderately acidic environment (pH near 6) to a basic environment will have on peroxidase activity ?
O Peroxidase activity will decrease.
O Peroxidase activity will increase.
O Peroxidase activity will stay the same.
O Peroxidase activity will increase at first and then decrease.
The effect that a change from a moderately acidic environment (pH near 6) to a basic environment will have on O Peroxidase activity will decrease.
What is Peroxidase activity?Demonstrated that the performance of hydrogen peroxidase was greatly affected by all three factors, temperature, concentration level, and pH.The peroxidases are enzymes whose primary function is to oxidize hydrogen donors at the expense of peroxides. They are highly specific for hydrogen peroxide, but they accept a wide range of hydrogen donors, including polyphenols.Thyroid peroxidase also called as thyroperoxidase (TPO) is mainly expressed in thyroid organs. It is a large transmembrane glycoprotein with covalently linked haem, present in cells on the apical membranePeroxidase activity was pH-dependent, with complete inactivation at pH 2.5 and when 8.5 The maximum enzyme activity observed at pH 6.5 decreased when the pH was reduced or increased; the drop was sharper in the alkaline than in the acid rangeTo learn more about Peroxidase activity refers to:
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Suzie has a bacterial infection that she caught after she had previously cut her hand. What category of infection is this
This category of infection is known as secondary infection, an infection that occurs during or after treatment for another infection.
A secondary infection is an infection that takes place for the duration of or after remedy for any other infection. It can be because of the primary remedy or through adjustments withinside the immune system. Two examples of a secondary infection are: Getting a vaginal yeast contamination after taking antibiotics to deal with an contamination because of bacteria. Secondary infection takes place for the duration of or after remedy of a number one infection due to the fact the regular bacterial vegetation is destroyed, permitting yeast to flourish. The immune device protects the frame from doubtlessly dangerous substances.
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Where is ATP made in respiration?
The majority of ATP synthesis takes place within the mitochondrial matrix during cellular respiration, with each molecule of glucose oxidized creating around 32 A T P molecules.
ATP produced in mitochondria serves as the main energy source for vital biological functions such muscle contraction, nerve impulse transmission, and protein synthesis. The majority of the ATP produced during cellular respiration is created in the mitochondrial matrix, where each glucose molecule that is oxidised yields roughly 32 molecules of ATP.
Gradients are produced as a result of protons being pumped out of the matrix as electrons move down the chain and release energy in the process.
Protons flow back into the matrix and are converted into ATP by an enzyme called ATP synthase.
The inner mitochondrial membrane contains ETS.
The majority of the ATP in cells is produced by the enzyme ATP synthase, which does this by converting ADP and phosphate to ATP. ATP synthase is found in the membrane of mitochondria, which are cellular organelles; in plant cells.
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All of the following are limitations of the biological species concept,
except for
it doesn't apply to asexual species.
it can't be applied to fossils.
it has trouble explaining hybrids, like wolf-dogs and grolar bears.
reasonably separating most species we see in day to day life..
Answer:
It can't be applied to fossils
Explanation:
It's because fossils aren't living organisms.
The mucosa secretes ________________________________________ that chemically digests food. After food is mixed with these secretions it is called ________________________________________.
Mucosa secretes hydrochloric acid which chemically digests food. Once food is mixed with this secretion it is called chyme.
Chemical digestion is the process of changing the molecules of organic matter present in food from complex forms to simple forms with the help of enzymes.
Mucosa is a tissue that lines all cavities in our body such as the tongue and digestive tract. In the digestive tract there is tissue that lines the surface of the stomach so that the stomach wall is protected from gastric acid abrasion. Mucosa will secrete hydrochloric acid which will activate pepsinogen to become pepsin to digest food chemically, namely to break down proteins into proteoses and peptones.
Chyme is food that has been stirred and mixed with stomach acid sap and has become mush after peristaltic events. Peristalsis occurs when the wall of the stomach consisting of three layers of muscles contracts and causes a movement that stirs and mixes food with gastric juice.
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define buoyant force state the factors on which the buoyant force depends
( how will give the first answer is will mark as in brainlist)
Answer:
Buoyant force is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object.
Explanation:
The buoyant force is applied to the object by the fluid in which the object is immersed. ... Therefore, from this, we can say that the two main factors for buoyant force are the volume of fluid displaced by the object and the density of the fluid. Note: The buoyancy force was discovered by Archimedes.
ssertion(A)-Metabolic gas diffuse freely across plasma membrane. Reason(R)-Plasma membrane is permeable to these gases.
Answer: The assertion is true and the reason is the correct explanation of the assertion
Explanation: This statement is true because the plasma membrane is selectively permeable, meaning that it allows some substances to pass through it while preventing others from crossing it. Gases like oxygen and carbon dioxide are small molecules that can easily diffuse through the membrane due to their size and lack of charge. Additionally, the plasma membrane has channels and pumps that specifically facilitate the movement of gases across the membrane. Therefore, metabolic gases can freely diffuse across the plasma membrane due to the permeability of the membrane.
HURRY I NEED HELP PLEASE
At its typical boiling point of 100°C, water has a vaporizing heat of 2260Jg⁻¹. This indicates that for water to convert from 1 g of liquid at 100°C to 1 g of steam at 100°C, it must absorb 2260 J of temperature.
What is the name of environment?An ecosystem, often known as the environment, is a natural system made up of all living things—plants, animals, and microbes—as well as all inanimate objects (abiotic components) that make up the environment.
Why is the environment so crucial?The status of the environment has a direct impact on human health and wellbeing. Good natural settings provide our fundamental requirements by providing fresh water, clean air, and a hospitable climate for growing food.
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Another name for the economic system in the United States is
Explanation:
The United States has a mixed economy. It works according to an economic system that features characteristics of both capitalism and socialism.
Explanation:
The US economy is considered a mixed economy - has features of capitalism, government ownership, and government regulation of the economy.
The United States is said to have a mixed economy because privately owned businesses and government both play important roles. ... In addition, Americans generally believe that an economy characterized by private ownership is likely to operate more efficiently than one with substantial government ownership.
Which statement describes a cell part needed by the cell to make proteins?
A.
Cell membranes contain phospholipids.
B.
Vacuoles contain water.
C.
The nucleus contains DNA.
D.
Chloroplasts contain chlorophyll.
Answer:
C.
The nucleus contains DNA.
You are competing in a 50-day survival challenge and can choose only one type of food to bring. What food do you choose and why: lard (Fat/Grease), Meat, or bread?
Which of the following is the most likely reason that the greatest number of extinctions of bird species occurred in the period 1901-2000
Increased environmental disturbances from human activities and altered bird habitats are the main reason behind the extinction of bird species between 1901-2000.
Between 1901 and 2000, 90 more mammal species went extinct than between 1801 and 1900. Environmental issues caused by human activities have gotten worse Changes in bird habitats between 1901 and 2000 was the main factor in the demise of numerous bird species.
When something is eradicated, it ceases to exist. There could be a lot of reasons for it, such as the extinction of some species as a result of overhunting, a lack of food, or natural disasters.
The mass extinction, which has only occurred five times throughout history, comes first. There are essentially two types of extinction. The second factor is background extinctions, which occur over a longer period of time and have a considerable impact on the pace of natural extinction.
The complete question is:
Which of the following is the most likely reason that the greatest number of extinctions of bird species occurred in the period 1901-2000?
(a). Increased environmental disturbances from human activities altered bird habitats.
(b). Deforestation
(c). Creating wildlife refugees
(d). species richness
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How can vegetarians make sure they get enough protein?
Vegetarians make sure they get enough protein by adding Beans and lentils ,Soy products ,Whole grains, Nuts and seeds in their daily meals .
Protein is one of the most essential nutrients for daily life , as they are required to help your body repair cells and make new ones. Protein also plays crucial role in growth and development in children and expecting mothers .
In general , proteins are required for the repairing and building your body's tissues, They also allows metabolic reactions to occurs at place for easy body function . so we can say that protein is crucial for maintaining structural framework of body and also helps in maintaining fluid balance .
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Why do cells need a high surface area to volume ratio ?
The surface area to volume ratio (SA:V) is a mathematical formula used to measure the relative size of a cell. It is the ratio of the surface area of a cell to its volume. Cells need to maintain a high SA:V in order to survive and function properly.
First, a high surface area to volume ratio is needed in order for the cell to take in essential nutrients and expel waste. All cells must take in oxygen, glucose, and other nutrients from the environment in order to survive, and they must also get rid of waste products such as carbon dioxide and other toxins. The surface area of a cell provides an area for the cell to access these materials, and the volume of the cell determines how much material can be moved in and out of the cell. A higher SA:V means that more of the cell's surface area is available to take in materials, and more of the cell's volume is available to expel waste.
Second, a high surface area to volume ratio is also necessary for the cell to carry out its metabolic processes. The metabolic processes of a cell require energy, which comes from the breakdown of glucose and other molecules. A higher SA:V allows for more of the cell's surface area to be used for enzyme-catalyzed reactions, and more of the cell's volume to be used for the storage and transport of molecules to and from the cell.
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